JP2012064978A - Wiring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiring system capable of protecting an electronic apparatus from static electricity, without hindering miniaturization of the electronic apparatus such as ECU.SOLUTION: The wiring system includes a circuit board 2 containing wiring patterns 5-12 on which an electronic element is mounted, electric wiring 23-30 to which an electronic component is connected, and a terminal array part 13 in which terminals 14-21 connected to the electric wiring 23-30 are arrayed in a plurality of numbers. The terminal array part 13 includes a first terminal 16 and a second terminal 15 arranged to adjoin each other. The first terminal 16 is connected to the wiring pattern 7 having a ground path among the wiring patterns or to the electric wiring 25 having the ground path among the electric wiring. The second terminal 15 is connected to the wiring pattern 6 on which the electric element 22 which is easy to suffer electrostatic breakdown from static electricity V is mounted, among the wiring patterns.

Description

  The present invention relates to a circuit board wiring system used in an environment where static electricity is applied.

  Electronic equipment such as an electronic control unit (hereinafter referred to as ECU) for a vehicle is configured such that static electricity charged on an operator, a vehicle body, or the like during vehicle assembly work or vehicle repair causes an input / output terminal of the ECU. May be applied. Static electricity is a high voltage of several thousand to several tens of thousands of volts. When such a high voltage is applied to the ECU, an electronic element built in the ECU is internally destroyed, causing a failure of the ECU. For this reason, the vehicle ECU is required to have resistance against static electricity as a product specification. For example, the specification is designated under the condition that “no failure occurs even when ± 25 KV static electricity is applied”.

  As a measure for protecting the ECU from static electricity, for example, as described in Patent Document 1, a current mirror circuit composed of transistors and a resistor connected between a power source for operating the transistors and the current mirror circuit or ground A method of forming a protection circuit by forming a circuit including an element on a circuit board of an ECU is known.

  According to this method, when a high voltage such as static electricity exceeding the operating voltage of the ECU is applied to the ECU, the high voltage is lowered within the range of the operating voltage of the ECU by the current mirror circuit and the resistance element. By doing so, the ECU is protected.

JP 2006-157578 A

  Although the electrostatic protection circuit has the effects as described above, in recent ECUs, it is required to reduce the size of the ECU by increasing the mounting density of the built-in circuit board. Therefore, it is difficult to secure a space for providing the current mirror circuit and the resistance element.

  Therefore, the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a wiring system capable of protecting an electronic device from static electricity without hindering downsizing of the electronic device, for example, an ECU. To do.

  A wiring system according to one aspect of the present invention is a wiring system including a circuit board having a wiring pattern on which an electronic element is mounted, and a terminal array unit in which a plurality of terminals are arrayed. Includes a first terminal and a second terminal arranged adjacent to each other, the first terminal being connected to a wiring pattern having a ground path among the wiring patterns, and the second terminal being Of the wiring patterns, an electronic element connected to a wiring pattern on which an electronic element that is easily destructible against static electricity is mounted and mounted on the wiring pattern having the ground path is an electronic element having an avalanche effect. It is characterized by that.

  According to the above wiring system, even if static electricity is applied to a wiring pattern on which an easily destructible electronic element is mounted, for example, during vehicle assembly work or vehicle repair, the first terminal is connected to the second terminal. By arranging it adjacent to the ground, static electricity can be grounded. That is, static electricity is first guided to the second terminal from the wiring pattern on which the easily destructible electronic element is mounted, and subsequently between the second terminal and the first terminal adjacent to the second terminal. Discharged. Thereafter, the discharged static electricity can be grounded through a ground wiring pattern which is a ground path connected to the first terminal. Thereby, it is possible to prevent static electricity from being directly applied to the easily breakable electronic element. Therefore, internal destruction of the electronic element can be prevented, and as a result, the ECU incorporating the electronic element can be prevented from deteriorating or losing its function.

  The electronic element mounted on the wiring pattern having the ground path is an electronic element having an avalanche effect. For this reason, since static electricity can be grounded through the electronic element having an avalanche effect mounted on one of a plurality of wiring patterns, it is easy to break down without reducing the mounting density of the circuit board. The electronic device can be protected from static electricity.

  A wiring system according to another aspect of the present invention includes a circuit board having a wiring pattern on which electronic elements are mounted, electrical wiring to which electrical components are connected, and terminals in which a plurality of terminals connected to the electrical wiring are arranged. A wiring system including an array unit, wherein the terminal array unit includes a first terminal and a second terminal arranged adjacent to each other, and the first terminal is a ground path in the wiring pattern. Or a wiring pattern having a ground path among the electrical wiring, and the second terminal is mounted with an electronic element that is easily destructible against static electricity in the wiring pattern. The electronic element connected to the wiring pattern and mounted on the wiring pattern having the ground path is an electronic element having an avalanche effect.

  According to the above wiring system, even if static electricity is applied to a wiring pattern on which an easily destructible electronic element is mounted, for example, during vehicle assembly work or vehicle repair, the first terminal is connected to the second terminal. By arranging it adjacent to the ground, static electricity can be grounded. That is, static electricity is first guided to the second terminal from the wiring pattern on which the easily destructible electronic element is mounted, and subsequently between the second terminal and the first terminal adjacent to the second terminal. Discharged. Thereafter, the discharged static electricity can be grounded through a ground wiring pattern or a ground electrical wiring, which is a ground path connected to the first terminal. Thereby, it is possible to prevent static electricity from being directly applied to the easily breakable electronic element. Therefore, internal destruction of the electronic element can be prevented, and as a result, the ECU incorporating the electronic element can be prevented from deteriorating or losing its function.

  In addition, it is possible to ground static electricity without providing a dedicated complicated circuit for static electricity countermeasures or a dedicated resistive element on the circuit board, so the mounting density of the circuit board is reduced. In other words, it is possible to meet the demand for downsizing of electronic devices that incorporate the circuit board, for example, ECUs.

  The electronic element mounted on the wiring pattern having the ground path is an electronic element having an avalanche effect. For this reason, since static electricity can be grounded through the electronic element having an avalanche effect mounted on one of a plurality of wiring patterns, it is easy to break down without reducing the mounting density of the circuit board. The electronic device can be protected from static electricity.

  In still another embodiment of the present invention, the electrical wiring having the ground path is grounded via an electrical component connected to the electrical component. The electrical component is, for example, a switch element having a plurality of contacts, and the electrical wiring is connected to one contact of the switch element, and the other contact is grounded. The electrical component may be a resistance element having a resistance value lower than that of the easily destructible electronic element, instead of the switch element. According to this configuration, since static electricity can be grounded through the electrical component connected to the electrical wiring, easily breakable electronic elements are protected from static electricity without reducing the mounting density of the circuit board. can do.

  According to the wiring system of the present invention, it is possible to protect the electronic device from static electricity without hindering the downsizing of the electronic device, for example, the ECU.

1 is a schematic diagram of a wiring system according to a first embodiment of the present invention. It is the schematic of the terminal arrangement | sequence part of the wiring system of FIG. It is the schematic of the wiring system which concerns on 2nd Embodiment of this invention. It is the schematic which shows the modification of 2nd Embodiment. It is the schematic of the wiring system which concerns on 3rd Embodiment of this invention.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a schematic diagram of a wiring system 1A according to the first embodiment of the present invention. This wiring system 1A has a circuit board 2 having first to eighth wiring patterns 5 to 12 on which predetermined electronic elements are mounted, and first to eighth terminals 14 to 21 arranged in a predetermined pattern. The first and eighth terminals 14 to 21 are connected to the terminal array 13 mounted on the circuit board 2 and the first to eighth electric circuits 32 to 39 having predetermined electrical components. 1st-8th electrical wiring 23-30.

  The circuit board 2 is a circuit board built in an electronic control unit (ECU) 3 for a vehicle, for example. As shown in FIG. 2, the first to eighth terminals 14 to 21 of the terminal arrangement unit 13 are arranged in a pattern of four in each of the upper and lower rows at a predetermined interval, not shown. The corresponding first to eighth wiring patterns 5 to 12 on the circuit board 2 are connected by lead wires or the like. Although FIG. 1 shows eight terminals and eight wiring patterns, the number thereof is not limited.

  As shown in FIG. 1, the third wiring pattern 7 connected to the third terminal 16 itself is configured as a ground path. Thus, the third terminal 16 is configured as a ground terminal that is always grounded. On the other hand, an easily destructible electronic element 22, for example, a capacitor, is mounted on the second wiring pattern 6 connected to the second terminal 15 adjacent to the third terminal 16. Here, “easy to break electronic device” means an electronic device having a high possibility of internal destruction when static electricity of several thousand to several tens of thousands of volts is applied. A semiconductor element such as an IC or a microcomputer can be used.

  According to the first embodiment, static electricity V is connected from the second electric wiring 24 to the second wiring pattern 6 on which the easily destructible electronic elements 22 are mounted, for example, during vehicle assembly work or vehicle repair. Even if the second terminal 15 is applied, the second terminal 15 is disposed adjacent to the third terminal 16 that is the ground terminal. I can escape. That is, as indicated by an arrow, the static electricity V is first led to the second terminal 15 disposed adjacent to the third terminal 16 that is the ground terminal, and subsequently between the second terminal 15 and the third terminal 16. After being discharged, the ground can be grounded via the third wiring pattern 7 which is a ground path connected to the third terminal 16. Thereby, it is possible to prevent static electricity V from being directly applied to the easily breakable electronic element 22 of the second wiring pattern 6. Therefore, internal destruction of the electronic element 22 can be prevented, and as a result, the ECU 3 incorporating the electronic element 22 can be prevented from deteriorating or losing its function.

  Even if the static electricity V is applied to the second electric circuit 33, as described above, the static electricity V is first guided to the second terminal 15 through the second electrical wiring 24, and subsequently to the second terminal 15 and After being discharged from the third terminal 16, it is grounded via the third wiring pattern 7. Thereby, it is possible to prevent static electricity V from being applied directly to the easily breakable electronic element 22 from the second electrical wiring 24 through the second terminal 15.

  Although the second terminal 15 is disposed adjacent to the third terminal 16, in the first embodiment, “adjacent” means that the static electricity V of several thousand to several tens of thousands of volts is generated by the second wiring pattern 6 or the second electrical circuit. When applied to the circuit 33, it means that the second terminal 15 and the third terminal 16 are arranged at an interval at which discharge is likely to occur. The third terminal 16 does not always need to be a ground terminal, and may be any terminal adjacent to the second terminal 15, for example, the first terminal 14 or the sixth terminal 19 may be the ground terminal.

  Furthermore, in the first embodiment, the third terminal 16 among the plurality of terminals is provided on the circuit board 22 of the ECU 3 without providing a dedicated complicated circuit for countermeasures against static electricity, a dedicated resistance element, or the like. Static electricity V applied to the second wiring pattern 6 or the second electric circuit 33 through the third wiring pattern 7 is connected to the third wiring pattern 7 which is a simple ground path on which no electronic element is mounted. Since it is only escaped, the mounting density of the circuit board 2 of the ECU 3 is not lowered, and the demand for downsizing of the ECU 3 can be met.

(Embodiment 2)
FIG. 3 is a schematic diagram of a wiring system 1B according to the second embodiment of the present invention. In the first embodiment, the third wiring pattern 7 connected to the third terminal 16 is configured as a ground path. In the second embodiment, the third electrical wiring 25 connected to the third terminal 16 is grounded. It is configured as a route. That is, the third electrical wiring 25 is connected to the third electrical circuit via the switch element that is the electrical component 40 that constitutes a part of the third electrical circuit 34. The switch element 40 has first to third contacts 41 to 43, and the third electrical wiring 25 is connected to the third electrical circuit 34 via the first contact 41 of the switch element 40. The second contact 42 of the switch element 40 is always grounded. Thus, when the first contact 41 and the second contact 42 of the switch element 40 are connected, the third electrical wiring 25 forms a ground path and the third terminal connected to the third electrical wiring 25. 16 is configured as a ground terminal.

  For example, the third electric circuit 34 is a circuit for driving a wiper of a vehicle. In this case, the switch element 40 is a switch for detecting whether or not the wiper blade of the wiper is stopped at a predetermined stop position. . When the wiper blade is at a predetermined stop position, the first contact 41 and the second contact 42 of the switch element 40 are always connected, so the third electric circuit 34 serves as a ground path. When the wiper blade is operating, the first contact 41 and the third contact 43 are connected.

  The switch element 40 is a switch for detecting theft of the radio mounted on the vehicle. When the radio is mounted at a predetermined position, the first contact 41 and the second contact 42 are connected. It may be a switch that is maintained in a grounded state.

  Furthermore, the switch element 40 is a switch that detects whether the seat belt of the vehicle is worn or not. When the seat belt is not worn, the first contact 41 and the second contact 42 are connected. It may be a switch that is maintained in a grounded state.

  Since the other configuration of the second embodiment is the same as that of the first embodiment, the description thereof is omitted. In FIG. 3, the electrical wiring and the electrical circuit other than the second electrical wiring 24, the third electrical wiring 25, and the third electrical circuit 34 are omitted for simplification of the drawing.

  According to the second embodiment, the static electricity V is a second terminal connected from the second electrical wiring 24 to the second wiring pattern 6 on which the electronic element 22 is mounted, for example, during vehicle assembly work or vehicle repair. 15, the second terminal 15 is disposed adjacent to the third terminal 16 that is the ground terminal, so that the static electricity V can be released through the third electric wiring 25 that is the ground path. That is, as indicated by an arrow, the static electricity V is first led to the second terminal 15 disposed adjacent to the third terminal 16 that is the ground terminal, and subsequently between the second terminal 15 and the third terminal 16. Discharge with. Thereafter, the static electricity V discharged to the third terminal 16 is guided to the third electrical wiring 25 which is a ground path connected to the third terminal 16, and the first contact 41 and the second contact point are connected to the first contact 41 during vehicle assembly work or vehicle repair. It can be grounded through the switch element 40 to which the contact 42 is connected. Thereby, it is possible to prevent static electricity V from being directly applied to the easily breakable electronic element 22 of the second wiring pattern 6. Therefore, internal destruction of the electronic element 22 can be prevented, and as a result, the ECU 3 incorporating the electronic element 22 can be prevented from deteriorating or losing its function.

  Even if the static electricity V is applied to the second electric circuit 33, as described above, the static electricity V is first guided to the second terminal 15 through the second electrical wiring 24, and subsequently to the second terminal 15 and Discharged between the third terminal 16. Thereafter, the static electricity V discharged to the third terminal 16 is guided to the third electrical wiring 25 and grounded via the switch element 40. Thereby, it is possible to prevent the static electricity V from being applied directly to the easily destructible electronic element 22 through the second terminal 15.

  In the second embodiment, when the circuit board 2 of the ECU 3 is in a specific state without separately providing a complicated circuit dedicated to measures against static electricity V, a dedicated resistance element, or the like, for example, a wiper When the wiper blade is at the specified stop position, the static electricity V is simply grounded by using the switch element 40 that is maintained in a grounded state, so that the mounting density of the circuit board 2 of the ECU 3 is not reduced, It is possible to meet the demand for downsizing the ECU 3.

  FIG. 4 is a schematic diagram showing a modification of the second embodiment of FIG. In the second embodiment, the third electrical wiring 25 is connected to the switch element 40 of the third electrical circuit 34. However, in this modification, the third electrical wiring 25 is connected to a resistance element that is an electrical component 45 constituting the third electrical circuit 34. It is connected. The resistance element 45 is grounded, whereby the third electrical wiring 25 is configured as a ground path via the resistance element 45. The resistance element 45 may be a resistance element having a resistance value lower than that of the easily breakable electronic element 22 of the second wiring pattern 6, and is, for example, a light bulb that constitutes a vehicle room light.

  According to this modification, the static electricity V discharged between the second terminal 15 and the third terminal 16 and guided to the third electrical wiring 25 passes through the resistance element 45 and is grounded. As a result, it is possible to prevent static electricity V from being directly applied to the easily breakable electronic element 22 (FIG. 3) of the second wiring pattern 6, thereby avoiding internal destruction of the electronic element 22.

  In the second embodiment of FIG. 3 and the modification of FIG. 4, the applied static electricity V is grounded outside the ECU 3 as described above.

(Embodiment 3)
FIG. 5 is a schematic diagram of a wiring system 1C according to the third embodiment of the present invention. In the present embodiment, an electronic element 47 such as a MOSFET element is mounted on the third wiring pattern 7, and the third electric wiring 25 is connected to a third electric circuit 34 that constitutes an electromagnetic relay switch, for example. ing. The electronic element 47 mounted on the third wiring pattern 7 may be any low-impedance electronic element that can ground the static electricity V by an avalanche effect when a high voltage such as static electricity V is applied. By selecting such an electronic element 47, the third wiring pattern 7 can be configured as a low impedance ground wiring pattern, and the third terminal 16 connected to the third wiring pattern 7 can be configured as a low impedance terminal, that is, Can be configured as a ground terminal. Since the other configuration of the third embodiment is the same as that of the first embodiment, the description thereof is omitted.

  According to the third embodiment, static electricity V is connected from the second electrical wiring 24 to the second wiring pattern 6 on which the easily breakable electronic elements 22 are mounted, for example, during vehicle assembly work or vehicle repair. Even if the second terminal 15 is applied, the second terminal 15 is disposed adjacent to the third terminal 16 which is the ground terminal, so that the static electricity V is passed through the third wiring pattern 7 having the ground path. I can escape. That is, as indicated by an arrow, the static electricity V is first guided to the second terminal 15 disposed adjacent to the third terminal 16 and subsequently discharged between the second terminal 15 and the third terminal 16. Then, it can be led to the third wiring pattern 7 connected to the third terminal 16. At this time, since the MOSFET element 47 mounted on the third wiring pattern 7 becomes conductive between the drain 48 and the source 49 due to the avalanche effect, the static electricity V can be grounded. Thereby, it is possible to prevent static electricity V from being directly applied to the easily breakable electronic element 22 of the second wiring pattern 6. Therefore, internal destruction of the electronic element 22 can be prevented, and as a result, the ECU 3 incorporating the electronic element 22 can be prevented from deteriorating or losing its function.

  Even if the static electricity V is applied to the second electric circuit 33, as described above, the static electricity V is first guided to the second terminal 15 through the second electrical wiring 24, and subsequently to the second terminal 15 and Discharged between the third terminal 16. Thereafter, the static electricity V discharged to the third terminal 16 is guided to the third wiring pattern 7 and grounded through the MOSFET element 47. Thereby, it is possible to prevent the static electricity V from being applied directly to the easily destructible electronic element 22 through the second terminal 15.

  In the first and third embodiments, the applied static electricity V is grounded inside the ECU 3 as described above.

  Since the breakdown voltage of air is about 30 KV / cm, if the distance between the second terminal 15 and the third terminal 16 is 8 mm or less, static electricity of ± 25 KV can be discharged. The distance between the terminals used in the vehicle ECU is extremely narrow, 2 to 3 mm or less for miniaturization and high performance of the ECU, can discharge static electricity of ± 25 KV, and meet the required specifications. Can do.

1A to 1C Wiring system 2 Circuit board 3 ECU
5 to 12 First to eighth wiring patterns 13 Terminal array portions 14 to 21 First to eighth terminals 22 Electronic elements 23 to 30 First to eighth electric wirings 32 to 39 First to eighth electric circuits V Static electricity

Claims (2)

A wiring system including a circuit board having a wiring pattern on which an electronic element is mounted, and a terminal arrangement portion in which a plurality of terminals are arranged,
The terminal arrangement part includes a first terminal and a second terminal arranged adjacent to each other,
The first terminal is connected to a wiring pattern having a ground path among the wiring patterns,
The second terminal is connected to a wiring pattern on which an electronic element that is easily destructible against static electricity is mounted among the wiring patterns,
The wiring system in which the electronic element mounted on the wiring pattern having the ground path is an electronic element having an avalanche effect. A wiring system comprising a circuit board having a wiring pattern on which an electronic element is mounted, an electric wiring to which an electrical component is connected, and a terminal arrangement portion in which a plurality of terminals connected to the electric wiring are arranged,
The terminal arrangement part includes a first terminal and a second terminal arranged adjacent to each other,
The first terminal is connected to a wiring pattern having a ground path among the wiring patterns, or an electrical wiring having a ground path among the electrical wirings.
The second terminal is connected to a wiring pattern on which an electronic element that is easily destructible against static electricity is mounted among the wiring patterns,
The wiring system in which the electronic element mounted on the wiring pattern having the ground path is an electronic element having an avalanche effect.

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